Why does a new pressure cooker of aluminum appears shinning and after use it loses its shine
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This is due to corrosion of aluminum metal when exposed to moist air.
Explanation:
Aluminum vessels lose their shine and become dull very soon after use. This is due to corrosion of aluminum metal when exposed to moist air. Whenever a shining aluminum vessel is exposed to moist air, the oxygen in the air reacts with aluminum to form a thin, dull layer of aluminum oxide throughout the vessel. Due to the formation of a dull layer of aluminum oxide exposure to moist air, the aluminum vessel will lose its shine very soon after use.
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